There were no riots, you don't get stabbed or shot just for existing in these cities. What planet are you living on?
Violent crime has been dropping for years in almost every major liberal city in America. Are there still random incidents? There always will be, but fun violence rates are actually higher in many rural and GOP led states than in major cities.
You need to get a grip and disconnect yourself from the propaganda the fascists are feeding you. The military does not belong in US cities.